1,3

See A210109 for further information.

Row sums of the following table which shows how many words of length n over a 4-letter alphabet are 3-divided in k>=1 different ways:

4;

41, 14, 5;

147, 111, 67, 29, 14, 6;

594, 358, 381, 211, 156, 128, 80, 28, 17, 7;

2072, 1400, 1433, 875, 821, 669, 588, 369, 340, 240, 163, 72, 33, 20, 8;

- R. J. Mathar, Mar 25 2012

Table of n, a(n) for n=1..11.

Cf. A210109.

Sequence in context: A060492 A234952 A112041 * A002060 A247739 A007220

Adjacent sequences: A210422 A210423 A210424 * A210426 A210427 A210428

nonn

R. J. Mathar, Mar 21 2012

approved